Valve-seat reamer



Nov. 27, 1928. 1,693,129

R. c. WILLIS VALVE SEAT REAMER Filed March 11, 1925 Patented Nov. 27, 1928.

UNITED STATES mix 0. WILLIS, or SEATTLE, WASHINGTON.

VALVE-SEAT REAMER.

Application filed March 1 1, 1925 Serial No. 14,740.

- This invention relates to an improved tool designed for use in connection with internal combustion engines, the invention serving to permit accurate reaming of valve seating surfaces, and also for reaming a true surface in the bushing below the valve portcommonly known as the valve stem guide.

The improved reamer is particularly adaptable-for resurfacing valve seats in that type of motor that has a removable cylinder head, and whose valve seats are cut directly in the cylinder block casting flush with the top of the block, and also for that type of motor that has a removable cylinder head with overhead valves, and whose valve seats are cut directlyin the cylinder head castings.

Briefly described, the present improvement comprises a novel mounting which is clamped directly upon the top of the cylinder block after the headhas been removed, there being a bracket slidably and adjustably supported upon this mounting, and this bracket constrtutin'g a carrier for an armor to which the reaming tool is connected, whereby to permit f the reamer to be shifted longitudinally along the mounting tothe desired point; V Accompanying the invention are numerous features and advantages derived from the particular construction and arrangement of parts briefly outlined, and these Wlll become apparent i'romf'the course of the following description. I

In the accompanying drawings, forming a part of this application, and in which like numerals are employed'to designate like parts throughout the same:

Figure 1 is a side elevation of a portion of a conventional form of cylinder block, showing a reamer, constructed in accordance with the present invention, in place upon said block.

Figure 2 is an end elevation with portions broken away and shown in section to disclose the construction and method of operation more clearly.

Figure 3 is a top plan view of the device removed from the cylinder block.

Specifically described, the invention comprises a mounting 1 which is in the form of an elongated base. The base is made from a single casting and is provided on its under side and at its corners with bored lugs 2,

7 adapted to permit passage of existing studs 3 on the cylinder block 4 therethrough, the same nut5, which serves to maintain the head (not shown), in place, being threaded on the ends of the studs to maintain the base in place. The'base is of a length corresponding to the length of the block to which it isattached, and itwill naturally vary in'size according to the particular block upon which it is to be used. Thebase is provided with a top plate 6, which must, of necessity, be extremely accurate and perfectly flat, so that it will be in'strict parallelism, with the fiat top of the cylinder block. Formed in the center of the top of this plate is a guide groove 7, which extends from end to end, and, in fact, through the opposite ends of the base. The cross section of the slot is indicated in Figure 2.

Cooperating with the base is what may be broadly designated as sliding bracket 8. This bracket includes a horizontally disposed flange 9, resting slidably upon the top surface of the top plate 6, and an upright 10. This upright 1s very sturdy in formation, and the upper end thereof is offset in a manner to project beyond one longitudinal side of i the base. This projecting end carries a vertical arbor guide 11. The guide may be of any length to insure rigidity and to guard against possible lost motion, when the tool is in operation. A comparatively long cylindrical arbor 12 is provided and extends slidably through this guide, this arbor being provided at its top with an appropriate removable cross piece 13 forming handles and having a reduced upper extremity 14, capable of permitting attachment of appropriate power thereto. The arbor is provided at its bottom with a conical socket, for'reception of the tapered shank of an appropriate seat reaming tool 15. This tool is provided with a depending stem 16, which functions as a centering'pin, and is adapted for reception in an opening provided in the usual valve stem guide 17.

In practice, the head is removed from the cylinder block, and the base 1 is placed over the usual cylinders, the lugs 2 being fitted over the existing studs provided on said blocks. In this way, the base of the device is rendered truly level with the surface of the cylinder block. The valve being removed, any selected seat may be reamed or resurfaced, by placing the reamer in position, as shown in Figure 2, with the shank thereof fitted into the socket in the lower end of the rotatable arbor 12, and by placing the bracket 8 opposite the seat to be surfaced. After this particular seat has been acted'upon, the nut 18 with which the bolt 19 is provided, is tightened, to maintain the bracket in adjusted position. Now, the bracket may be shiftedupon the base to the next seat, and so on. In this 7 way, it is entirely unnecessary to disassemble and remove any part of the reaming device, until all of the seats have been treated.

sequently, being'rendered fool proof, inasmuch as it cannot be mounted improperly.

There is little, or no liability of disalignment, even if it is mounted upon a Warped cylinder block. A construct-ion of the kind specified entirely obviates the necessity of bodily movingrthe tool from place to place as each seat is reamed. The bracket including the up- I right and the guide constitutes a most impertant feature of the invention. Such a structure assures accuracyand perfect work. The upright of the bracket being very sturdy, itis valmost impossible to bend it or get it more than one-thousandth of an inch out of alignment. Then, this upright, together With its horizontal'seatingand sliding flange being made of tool steel, and being bolted firmly in place will not give and will form an accurate combination of eleni-entsin positively assuring accuracy in operation. The operator may therefore carry out the operation in the shortest time possible, Without fear of the formation of an improper seat. 7

The invention serves to accomplish numerous other advantages, but these need not be enumerated, it is thought. It is also thought that the foregoing description, taken in connection with the accompanying drawing will enable persons skilled in thelart to Which the invention relates to obtain a clear understanding of the same. Therefore, a more lengthydesoription is thought unnecessary.

Although the preferred embodiment of the invention has been shown and described, it

is to be understoodthat minor changes coming Within the field of invention claimed may be resorted to, if desired.

I claim: e

A valve seat rea ner adapted to be removably secured vto a cylinder'block comprising a base having a bearing surface substantially coextensive With the length of .the block including the valve seats, the upper surface of the base presenting a surface at true right angles to the axisjof the valve seats, a tool mounting comprising a bracket having a broad bearing on the base, a connection between the bracket andbase to permit a free rotative movement of the bracket With respect to the base, said connection having slidable connection with the base on a line parallel to a line joining the valve seats, at; elongated arbor guideicarried by the bracket and disposed beyond one edge thereof to permit the guide to be arranged in directaxial alignment with any valve seat, said arbor guide in any position of adjustment being maintained at a direct right angle to the bearing surface of the base, and a tool arbor freely slidable and rotatable in the arbor guide and held against any tilting movement therein, the lower end of the arbor being formed to removably cooperate with a resea-ting tool, whereby with the bracket adjusted to dispose the arbor guide and valve seat in axial alignment, the tool is compelled to cut the seat at right angles to the surface of the head.

In testimony whereof I aflix my signature.

' REX c. WILLIS. 

